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Polyurethane diaphragm for invisible orthodontics, preparation method and application

A polyurethane film, invisible orthodontic technology, applied in the field of biomedical science and technology, can solve the problems of reducing material transparency, difficult to uniformly disperse nano-materials, affecting product stability and resilience retention, etc., to increase strength and toughness. Effect

Inactive Publication Date: 2021-12-10
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the above methods introduce inorganic materials through simple physical blending. It is difficult to achieve uniform dispersion of nanomaterials in the body, which is not conducive to the effective improvement of material strength and rebound rate.
More importantly, the phase separation of the material will not only affect the stability and resilience of the product, but also significantly reduce the transparency of the material, greatly affecting the aesthetic effect of the invisible product

Method used

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  • Polyurethane diaphragm for invisible orthodontics, preparation method and application
  • Polyurethane diaphragm for invisible orthodontics, preparation method and application
  • Polyurethane diaphragm for invisible orthodontics, preparation method and application

Examples

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preparation example Construction

[0045] like figure 1 As shown, the preparation method of the invisible orthodontic diaphragm provided by the embodiment of the present invention comprises the following steps:

[0046] S101, prepolymerization: dissolving polyester diol or polyether diol in dimethylformamide, introducing nitrogen gas, adding diisocyanate and dibutyltin dilaurate for stirring;

[0047] S102, chain extension: cooling and adding small molecules and nano-hydroxyapatite to react to obtain a polyurethane resin solution;

[0048] S103, molding: the resin solution is rotary evaporated to remove the solvent, and an appropriate amount of polyurethane resin is added for cooling.

[0049] In step S101, according to the embodiment of the present invention, the polyester diol or polyether diol is dissolved in dimethylformamide, nitrogen is introduced, and diisocyanate and dibutyltin dilaurate are added for stirring, including:

[0050] Dissolve the polyester diol or polyether diol after drying and dewateri...

Embodiment 1

[0057] The preparation method of the invisible orthodontic diaphragm provided by the embodiment of the present invention comprises the following steps:

[0058] (1) Prepolymerization: Dissolve 240 parts of polyethylene glycol (Mn=1000) in 500 parts of dimethylformamide after vacuum dewatering, 100 parts of isophorone diisocyanate and 8 parts of dibutyl dilaurate Tin is added to the reactor, the reactor is pre-passed with nitrogen, and the prepolymer is obtained by reacting at 80-90 °C for 2 hours under stirring conditions;

[0059] (2) Chain extension: the system is cooled to 60-70°C, 60 parts of 1,4-butanediol and 60 parts of nano-hydroxyapatite are added, and the reaction is stirred for 2h;

[0060] (3) compression molding: the obtained product is distilled to remove the solvent under reduced pressure, and the polyurethane pellets are obtained through an extrusion granulator, the raw materials are added to the mold, and the pressure is maintained at 9-12 MPa for 5-8 minutes ...

Embodiment 2

[0063] The preparation method of the invisible orthodontic diaphragm provided by the embodiment of the present invention comprises the following steps:

[0064] (1) Prepolymerization: Dissolve 260 parts of polyethylene glycol (Mn=1000) in 500 parts of dimethylformamide after vacuum dewatering, 120 parts of isophorone diisocyanate and 8 parts of dibutyl dilaurate Tin is added to the reactor, the reactor is pre-passed with nitrogen, and the prepolymer is obtained by reacting at 80-90 °C for 2 hours under stirring conditions;

[0065] (2) Chain extension: the system is cooled to 60-70°C, 70 parts of 1,4-butanediol and 60 parts of nano-hydroxyapatite are added, and the reaction is stirred for 2h;

[0066] (3) compression molding: the obtained product is distilled to remove the solvent under reduced pressure, and the polyurethane pellets are obtained through an extrusion granulator, the raw materials are added to the mold, and the pressure is maintained at 9-12 MPa for 5-8 minutes ...

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Abstract

The invention belongs to the technical field of biomedical materials, and discloses a polyurethane membrane for invisible orthodontics, a preparation method and application. The polyurethane membrane for invisible orthodontics is prepared from the following components in parts by mass: 100-120 parts of diisocyanate, 180-280 parts of polyester or polyether glycol, 50-100 parts of nano hydroxyapatite, 50-100 parts of micromolecular dihydric alcohol or diamine, 400 to 600 parts of dimethylformamide and 1 to 10 parts of dibutyltin dilaurate. According to the preparation method, nano-hydroxyapatite is added while a prepolymer is subjected to a chain extension reaction; the nano-hydroxyapatite is doped into a formed polyurethane elastomer through an in-situ polymerization technology; by means of the covalent bond density between the nano-hydroxyapatite and a high polymer material and the physical cross-linking effect of the nano-hydroxyapatite, the strength and the rebound rate of the material are improved. By changing the proportion of the nano-hydroxyapatite, the performance of the finally obtained membrane can be regulated and controlled so as to adapt to the requirements of different patients.

Description

technical field [0001] The invention belongs to the technical field of biomedical science and technology, and in particular relates to a polyurethane diaphragm for invisible orthodontics, a preparation method and an application. Background technique [0002] At present, with the improvement of people's aesthetics, more and more patients with malocclusion begin to seek orthodontic treatment. For orthodontic treatment, people need to try to avoid affecting their normal life without affecting their appearance. The traditional orthodontic treatment mainly uses bracket straight wire orthodontic technology. Because the aprons used to fix the arch wire on the bracket are prone to loss of strength, the push spring that expands the gap needs to be continuously adjusted when the teeth move mesial and distal. This increases the number of patient visits; the movement of the teeth requires the arch wire to slide relative to the bracket, so the friction force generated is difficult to est...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/66C08G18/48C08G18/32C08K3/32C08L75/08C08J5/18A61C7/08
CPCC08G18/10C08G18/6674C08G18/4833C08K3/32C08J5/18A61C7/08C08K2201/011C08K2003/325C08J2375/08C08G18/3206
Inventor 李玉林夏伦果房兵张世豪袁玲君
Owner EAST CHINA UNIV OF SCI & TECH
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